A229447 - cp's OEIS frontend

A229447 Number of 4 X n 0..2 arrays with horizontal differences mod 3 never 1, vertical differences mod 3 never -1, and rows and columns lexicographically nondecreasing.

n	a(n)
1	12
2	25
3	53
4	109
5	212
6	387
7	665
8	1083
9	1684
10	2517
11	3637
12	5105
13	6988
14	9359
15	12297
16	15887
17	20220
18	25393
19	31509
20	38677
21	47012
22	56635
23	67673
24	80259
25	94532
26	110637
27	128725
28	148953
29	171484
30	196487
31	224137
32	254615
33	288108
34	324809
35	364917
36	408637
37	456180

[12, 25, 53, 109, 212, 387, 665, 1083, 1684, 2517, 3637, 5105, 6988, 9359, 12297, 15887, 20220, 25393, 31509, 38677, 47012, 56635, 67673, 80259, 94532, 110637, 128725, 148953, 171484, 196487, 224137, 254615, 288108, 324809, 364917, 408637, 456180]

cp's OEIS Frontend

A229447 Number of 4 X n 0..2 arrays with horizontal differences mod 3 never 1, vertical differences mod 3 never -1, and rows and columns lexicographically nondecreasing.

Table of values

List of values